"At Last" is a song written by Mack Gordon and Harry Warren for the musical film Sun Valley Serenade (1941). Glenn Miller and his orchestra recorded the tune several times, with a 1942 version reaching number two on the US Billboard pop music chart.

Mack Gordon was an American lyricist for the stage and film. He was nominated for the best original song Oscar nine times in 11 years, including five consecutive years between 1940 and 1944, and won the award once, for "You'll Never Know". That song, along with "The More I See You," has proved among his most enduring, and remains popular in films and television commercials to this day. "At Last" is another of his best-known songs.